rewrite of field access using on_name

much cleaner and revealed a bug

lib/soml/compiler/field_access.rb

@@ -2,41 +2,25 @@ module Soml
   Compiler.class_eval do
 
     def on_field_access statement
-      #puts statement.inspect
       receiver_ast , field_ast = *statement
-      receiver = receiver_ast.first_from(:name)
+      receiver = process(receiver_ast)
+      
+      clazz = Register.machine.space.get_class_by_name receiver.type
+
       field_name = field_ast.first_from(:name)
 
-      case receiver
+
-      when :self
+      index = clazz.object_layout.variable_index(field_name)
-        index = @clazz.object_layout.variable_index(field_name)
+      raise "field access, but no such field:#{field_name} for class #{clazz.name}" unless index
-        raise "field access, but no such field:#{field_name} for class #{@clazz.name}" unless index
+      value = use_reg(clazz.object_layout.type_at(index))
-        value = use_reg(@clazz.name) #TODO incorrect, this is the self, but should be the type of variable at index
+
-        add_code Register.get_slot(statement , :message , :receiver , value )
+      add_code Register.get_slot(statement , receiver , index, value)
-        # reuse the register for next move
-        move = Register.get_slot(statement, value , index , value )
-        add_code move
-      when :message
-        #message Slot
-        value = Register.message_reg
-      else
-        if( index = @method.has_arg(receiver)) #argument
-          value = use_reg @method.arguments[index].type
-          code = Register.get_slot(statement , :message , Parfait::Message.get_indexed(index), value)
-        else # or a local so it is in the frame
-          index = @method.has_local( receiver )
-          if(index)
-            value = use_reg @method.locals[index].type
-            frame = use_reg :Frame
-            add_code Register.get_slot(statement , :message , :frame , frame )
-            code = Register.get_slot(statement ,frame , Parfait::Frame.get_indexed(index) , value )
-          else
-            raise "Variable not defined #{receiver}"
-          end
-        end
-      end
 
       value
     end
+
+    def on_receiver expression
+      process expression.first
+    end
   end
 end